Novel Channel Estimation Techniques in IEEE 802.11p Environments

Lin, Chi-Sheng; Lin, Jia-Chin

doi:10.1109/vetecs.2010.5493969

Cited by 26 publications

(13 citation statements)

References 9 publications

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“…To remedy this problem, it has been proposed in [44] to periodically insert midambles pilots in the data field to provide channel update and tracking after the initial channel estimation based on the block pilots. However, as noted in [45], such a midamble insertion scheme will lower the spectrum utilization efficiency due to the reduced ratio of data symbols in each frame. In [45], a Zadoff-Chu sequencebased time domain LS estimation scheme has been developed to improve the estimation accuracy, where the pseudo noise sequence is inserted into the prefix to combat severe multipath fading without sacrificing spectrum efficiency.…”

Section: Vehicular Channel Estimationmentioning

confidence: 99%

Vehicular Communications: A Physical Layer Perspective

Liang

Peng

et al. 2017

IEEE Trans. Veh. Technol.

219

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Vehicular communications have attracted more and more attention recently from both industry and academia due to their strong potential to enhance road safety, improve traffic efficiency, and provide rich on-board information and entertainment services. In this paper, we discuss fundamental physical layer issues that enable efficient vehicular communications and present a comprehensive overview of the state-of-the-art research. We first introduce vehicular channel characteristics and modeling, which are the key underlying features differentiating vehicular communications from other types of wireless systems. We then present schemes to estimate the time-varying vehicular channels and various modulation techniques to deal with high-mobility channels. After reviewing resource allocation for vehicular communications, we discuss the potential to enable vehicular communications over the millimeter wave bands. Finally, we identify the challenges and opportunities associated with vehicular communications.

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Section: Vehicular Channel Estimationmentioning

confidence: 99%

Vehicular Communications: A Physical Layer Perspective

Liang

Peng

et al. 2017

IEEE Trans. Veh. Technol.

219

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“…However, the convergence velocity of the coefficients estimation cannot track the channel changes. Pseudo-Random-Postfix OFDM (PRPOFDM), which inserts additional pseudo-random sequences before guard intervals, has been proposed in [5] [6]. However, adding additional training sequence sacrifices the data rate.…”

Section: Introductionmentioning

confidence: 99%

Pilots Aided Channel Estimation for Doubly Selective Fading Channel in Vehicular Environment

Cai

Jiang

Qian³

et al. 2013

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Abstract. In vehicle communications, channel characteristic experiences time and frequency selective fading due to high velocity of vehicle and rapid changes of surrounding scatters. The packet format for IEEE 802.11p standard limits the choice of channel estimation algorithms. Conventional channel estimation algorithms perform the channel estimation based on the long preamble training sequence, then applies the estimated channel response to compensate for the entire packet. These algorithms are not optimal for a doubly selective channel in vehicle communications. In this paper, to overcome the effect of doubly selective channel, we propose a novel pilot insertion scheme that covers all subcarriers in both the time and frequency domains simultaneously. Adaptive channel estimation and equalization algorithms are then developed based on the new system architecture. Simulations show significant improvements comparing to other exiting methods.

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“…Both channel estimation and synchronization are important issues in OFDM systems. Several channel estimation methods have been proposed to improve and evaluate system performance in IEEE 802.11p environments [5]- [7]. Due to the Doppler effect and the mismatched local oscillators, carrier frequency offset (CFO) destroys the orthogonality between subcarriers and causes inter-carrier interference (ICI).…”

Section: Introductionmentioning

confidence: 99%

Novel frequency offset estimation for IEEE 802.11p standard in V2V channels

Lin

Liu

Lin

2012

2012 12th International Conference on ITS Telecommunications

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For inter-vehicle communications, the IEEE 802.11p standard has been employed in the U.S. and Europe. This configuration is an OFDM-based system, so it still has to cope with the issue of frequency synchronization. In this paper, a pilotaided estimation technique is developed for the compensation of frequency offset in vehicle-to-vehicle (V2V) channel environments. The proposed synchronization algorithm utilizes the correlation between two identical halves of a training sequence after the appropriate choice of coarse compensation. As a result, the estimation method indeed has the potentials to further enhance the mean square error (MSE) performance compared with the other conventional schemes. Some simulation results are given to illustrate the advantages of the proposed frequency offset estimation scheme for vehicular communications.

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Novel Channel Estimation Techniques in IEEE 802.11p Environments

Cited by 26 publications

References 9 publications

Vehicular Communications: A Physical Layer Perspective

Vehicular Communications: A Physical Layer Perspective

Pilots Aided Channel Estimation for Doubly Selective Fading Channel in Vehicular Environment

Novel frequency offset estimation for IEEE 802.11p standard in V2V channels

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